[Bug rtl-optimization/67441] Scheduler unable to disambiguate memory references in unrolled loop

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67441

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hum - it's a bug that the unroller leaves the same MEM_EXPRs because now the
later load/store does not seem to alias one with an adjusted MEM, like for

 for (i = 0; i < SIZE; i++)
  {
    x[i] = x[i] + 1.0;
    x[i+1] = x[i+1] + 2.0;
  }

we'd get invalid non-alias answers from the orcale for an unrolled body.

Not sure if there is any transform that would result in invalid code though
(well, scheduling, of course...).